1. Department of Chemistry The Hong Kong University of Science and Technology (HKUST) Clear Water Bay Kowloon Hong Kong
2. HKUST‐Shenzhen Research Institute No. 9 Yuexing 1st Road, Hi‐tech Park Nanshan Shenzhen 518057 P. R. China
3. Department of Electrical Engineering and Information Systems School of Engineering The University of Tokyo 7‐3‐1 Hongo Bunkyo‐ku Tokyo 113‐8656 Japan
4. Thin‐Film Device Laboratory & Center for Emergent Matter Science (CEMS) RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan